Chains and heterogens:
PDB Chain Sequences:
>1xsm_ (-) npsvedepllrenprrfvvfpieyhdiwqmykkaeasfwtaeevdlskdiqhwealkpde rhfishvlaffaasdgivnenlverfsqevqvtearcfygfqiamenihsemysllidty ikdpkereylfnaietmpcvkkkadwalrwigdkeatygervvafaavegiffsgsfasi fwlkkrglmpgltfsnelisrdeglhcdfaclmfkhlvhkpaeqrvreiitnavrieqef ltealpvkligmnctlmkqyiefvadrlmlelgfnkifrvenpfdfme